vdw 840 plus 1KFugenmörtel

For the jointing of natural stone and concrete paving, slabs, and clinker facings for garden paths, entrance areas, and terraces

Water-compatible, without quality loss
No manual compaction required, self-compacting effect
Suitable for processing in light rain
For narrow joints from 3 mm
Almost binder film-free facings
Ready to use
Suitable for ceramic terrace elements
Water-permeable

Description:
Air-oxygen-hardening, ready-to-use joint mortar with graded mineral grain mixture
Binder: single-component, highly modified, air-oxygen-hardening liquid polymer
Joint width: continuously at least 3 mm, maximum 20 mm
Joint depth: at least 30 mm; for joint widths 15 mm, the joint depth must be at least twice the joint width
Delivery form: 12.5 kg and 25 kg PE bags vacuum-packed in PE buckets

Material properties:
Flexural strength: approx. 8.0 N/mm
Compressive strength: approx. 16.0 N/mm
Shelf stability: 18 months in dry conditions

Processing data:
Processing time: approx. 45 minutes at 20°C
Open time: minimum 5°C, maximum 25°C
Substrate temperature: minimum 5°C, maximum 25°C

Application:
Compared to common air-oxygen-hardening 1KF joint mortars, vdw 840 plus 1KF joint mortar is characterized by higher strength and the ability to flush the mortar with a water jet

Prerequisites:
Solid, load-bearing, and permanently water-permeable substrate, joint depth ? 30 mm, joint width continuously ? 3 mm, maximum 20 mm, object and ambient temperature between 5°C and 25°C

Test surface:
With natural and concrete stone facings, contact between vdw 840 plus 1KF joint mortar and the stone surface may cause optical changes, such as darkening and/or staining
We generally recommend creating a test surface
If necessary, we recommend using vdw 950 Steinschutz 3 in 1

Preparation:
Clean the surface of the object to be jointed thoroughly

Preliminary steps:
Pre-wet the surface thoroughly. When pre-wetting and cleaning, always use clean and cold tap water!

Filling the joints:
Cut open PE bag, then remove a portion of the mortar from the container, apply to the wet surface, and flush into the joints with a gentle water jet and a rubber squeegee. Clean excess mortar residues from the surface with a water spray, without washing out the joints. Repeat these steps until all mortar has been processed. A slight binder film may remain depending on the stone type. Sweep the surface with a damp coconut broom, ensuring the joint edges are free and clear!

Post-treatment:
The following points refer to a temperature of 20°C and 65% relative humidity. Higher temperatures shorten, lower temperatures extend the curing time. Cover the freshly jointed surfaces for at least 24 hours. Afterward, the surfaces are walkable. Protect the freshly jointed surfaces from moisture for at least 24 hours. Moisture exposure during curing can delay or impair the achievement of final strength. Final approval of the surfaces should be after 7 days. Generally, a strength test should be performed before putting the surfaces into operation.